Machine for bending sheet metal.



"d N0.7e2,5oo. PATENTED 31111514, 1904. l

E. G. H. STEIN & J. MANDEL. MACHINE POR BENDINVG SHEET METAL.

APPLIOATIONFILED .TUNE 16, 1903.

N0 MODEL.

2 SHEETS-SHEET l.

H rl'lqnlm z A rra/mns PATENTED JUNE 14, 1904. E, 0. E. STEIN EJ. MANDEL. MACHINE TOR BENDING SHEET METAL.

APPLICATION FILED JUNE 16. 1903,.

Nog 762,500.

N0 MODEL. a sums-SHEET a.

l L I v WU w 5f IHIIIIIIIIIII flllllml'rllmlllm fr' f l iillllllllllllllllllllHIIIIIIII 45 W '0 Y Vnro/Mfrs UNITED YSTATES Patented J' une 14,1904.

PATENT OEEICE.

EMIL G. H. STEIN AND JOHN MANDEL, OF NEW YORK, N. Y.

MACHINE FOR BENDING SHEET METAL.

SPECIFICATION forming part of Letters Patent No. 762,500, dated June 14, 1904.

Application iiled June 16, 1903.

T0 rtl?, whom it may concern:

Be it known that we, EMIL Gr. H. STEIN and JoI-IN MANDEL, citizens of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Machines for Bending Sheet Metal, of which the following is a specification, such as will enable those skilled in the art to which it ap'-- pertains to make and use the same.

The object of this invention is to provide a well-known form of sheet-metal-bending machine with improvements whereby sheet metal may be conveniently bent into pipe-sections angular in cross-section and adapted for use as air-conduits, Ventilating-pipes, iues, &c., and provided with interlocking endpieces or couplings, such as is shown and described in United States Letters Patent granted to us on the 21st day of April, 1903, No. 726,004.

The machine to which our improvements are applied is that covered by Letters Patent of the United States, granted to George O. Keene July 1, 1884, No. 301,128, and the said improvements will be fully described in the following specification in connection with the said machine of such parts thereof as may be necessary to fully illustrate and describe our improvements.

The invention is fully disclosed in the following specification, of which the accompanying drawings form a part, in which the separate parts are designated by suitable reference characters in each of the views, and in which- Figure 1 is a front view of a machine of the class referred to provided with our improvements; Fig. 2, a sectional end view thereof; Fig. 3, a sectional front view of the end thereof shown in Fig. 2; Fig. 4, a view of a detail of the construction which we employ; Fig. 5,

a front view of a part of the upper movable jaw of the machine as improved by us; Fig.

- 6, a bottom plan view thereof; Fig. 7, afront View of a part of the lower movable jaw of the machine; Fig; 8, a plan viewl thereof; Fig. 9 a plan, view of the swinging jaw of the machine; FigOrafront view thereof; Fig. 11,

Serial No. 161,700. (No model.)

yan inner perspective view of an attachment which we apply to the upper movable jaw of the machine; Fig. 12, a perspective plan view of an attachment which we apply to the lower jaw of the machine; Fig. 13, an inside perspective view of an attachment which we apply to the swinging jaw of the machine; Fig. 14, a view similar to Fig. 11, showing amodiiication; Fig. 15, a view similar to Fig. 1Q, showing a modification; Fig. 16, a view similar to Fig.'13, showingamodiication; Fig. 17, a view'of a die or dies which we employ, and Fig. 18 a perspective View of another detail of the construction.

In the drawings forming part of this specification we have shown the machine covered by United States Letters Patent No. 301,128, dated July 1, 1884, hereinbefore referred to, or such parts thereof as are necessary to illustrate our improvements, and this machine is provided with a lower movable jaw a, an upper movable jaw and a front swinging jaw c, having a handle or handles c2, by which it is operated. All of these jaws are mounted in the top A portion of a rigid main frame, of

vwhich the upright end members CZ form the principal parts, and the lower jaw c is adapted to be raised by means of pedals (Z2, mounted on the shaft d3 in the bottom of the frame and provided with headsd", through which the shaft dpasses and which are provided with recesses d5, which receive the lower ends of vertically arranged and movable members d, which operate in sockets Z7 in the lower part of the jaw a.

The swinging jaw cis supported in front of the bottom jaw a by means of trunnions c, which pass through the frame members CZ and are provided with collars c3, to which are rigidly secured arms c", provided with weights c5, which assist in the manipulation of said jaw.

The upper and vertically-movablel jaw l) is Vprovided at each end with a projection b2, and these projections fit in and are vertically movable in corresponding recesses in the end frame members CZ, and over said projections are placed screws b, which limit the vertical movement of said jaw. The means for raisingthis fz, 02, and d2, and in order jaw constitute one of the features of our invention and consist o'f journals mounted in the end frame members (I, and each of which is provided at its inner end with a cam-block 5 and at its outer end with a sleeve to each of which are secured a handle and a rod 7)", provided with a weight 7), and these weights assist in raising' the jaw the cam-blocks ff being adapted to bear on the bottom surface of said jaw, as clearly shown in Figs. 2 and 3. One side of the outer end of the journals b" is cut away, and the sleeves are similarly formed, so that said sleeves cannot turn on said journals, and the handles and rods s are rigidly connected with said sleeves.

The front part of the jaw e is provided with a top flat surface c and a sharp front edge d, and the jaw is provided with a sharp front edge c and with a flat bottom surface e2, which preferably consists of a hard steel plate secured thereto in any desired manner. In the practice of our invention we secure to the forwardly-directed edge of the upper jaw a su pplemental attachmentf, which is V- shaped in cross-section, and tothe top flat surface of the jaw t we secure a plate g, and to the front portion of the swinging jaw c we secure a plate L. One form of the attachmentf and plates f/ and is shown in Fig's. 14k to 16, inclusive, and another form thereof is shown in Figs. 11 to 13, inclusive In using' the forms shown in Figs. 14 to 16, inclusive, they may be secured in position by means of screws, and for this purpose the said attachment fand plates g and /L are provided, respectively, with holes that the plate /L may be held with sufiicient rigidity it is provided with a rib I, which lits in a corresponding groove in the swinging Ijaw c, and in order to further adapt the device to our purpose the front edge of the plate f/ is beveled, as shown at ,r/i, and the top edge of the plate /L is provided with a thickened member IX, the back of which is beveled, as shown at t', to correspond with the bevel of the plate r/. Although these attachments may be secured to the jaws a, 7), and c by screws or in any other way, we prefer to connect them with said jaws in the following manner: In the top surface o'f the jaw n, we form transverse grooves a" of the tongueand-groove class, and the plate g/ is provided with corresponding' tongues y", as shown in Fig. 12. The bottom surface of the jaw at the edge thereof, is also provided with grooves z' of the tongue-and-groove class, and the attachment j' is provided with corresponding tongues f, as shown in Fig'. 11, adapted to enter said grooves, and in order to place the attachments f and r/ in position they are simply moved backwardly, so that the tongues y" and f on the plate f/ and attachment f will enter the corresponding grooves a" and vf in the jaws c and rl`he swinging jaw c is also provided in the top thereof with diagonallyarranged and transverse grooves y', (clearly shown in Fig. 9,) and the plate /z/ is provided beneath the thickened top portion thereof with corresponding' tongues or projections f2, and in practice the plate /L is moved laterally to the left and backwardly, so as to cause the tongues or projections f2 to enter the grooves y, while the rib portion /3 enters the corresponding groove j in the swinging jaw c. 'lhe swinging jaw c may also be preferably provided at one or both ends with a pivot-clip (Z4, which is adapted to be turned se as to overlap the ends of the plate 71, and assist in holding' it in position, as shown in Fig. 1.

In United States Letters Patent N o. 728, O04, granted April 21, 1903, and hereinbefore referred to, we have described and claimed a form of pipe used as an air-conduit, ventilating-pipe, and the like, said pipe consisting of separate sections angular in cross-section and connected at the ends by angular projections and locking devices adapted to be slipped onto said projections, the connection of the separate sections of the pipe being such that the interior surface thereof is flush, smooth, and even throughout, the separate pipe-sections being adapted to be connected by simply applying the locking device and disconnected by removing said locking device, and it is for the purpose of forming the angular projections on the ends of the pipe-sections and for forming said sections that this improvement.

It will be understood, of course, that a sheet of metal in order to be formed into a pipe-section which is ang'ular in cross-section must be bent into a plurality of sides, preferably three or four, and in order to do this the angular interlocking projections at the ends of the pipe-section, as shown and described in our prior patent, above referred to, must iirst he formed before the sheet of metal is bent into the form of a pipe-section, and in order to do this the end of the sheet is slitted at regular intervals corresponding with the width of the sides of the pipe-section, and the interlocking' projections are formed by placing the end of the sheet between the jaws L and of the machine, raising the jaw e, so as to clamp the sheet between the jaws c and and then swinging' the jaw c forwardly and upwardly and bending' the sheet up over the sharp edge of the jaw After this is done the sheet may be taken out and one of the side edges thereof inserted between the jaws c and and the above-described operation repeated, and in this way the pipesection is formed. In order, however, to form the pipe-section after the interlocking end projections have been formed on the sheet, a space inust be provided for said interlocking IOO IOS

IIO

IZO

projections between the jaws e and and it' ployed, and in Fig. 1 of the drawings two of said attachments are shown,separated by the line k, and it will be understood that in bending a sheet of metal into a pipe-section the interlocking end projections thereof are inserted between the jaws t and Z) at the ends of the attachments, while the body of the sheet is clamped between said attachments. A similar result may be accomplished to an extent by cutting out the upper surfaces of the bottom jaw c, at the ends thereof, as shown at m in Fig. 3, and in using this form of construetion the interlocking end projections of the pipe-sections are first formed, as hereinbefore described, and in bending a sheet of metal into a pipe-section the interlocking end projections are passed into the transverse slot or opening m at one end of the jaw a, while the sheet is clamped between the jaws a and b and bent to form the pipe-section, as hereinbefore described. The swinging jaw c is provided with curved end arms m2, by which it is supported and on which the journals c" are formed, and these end arms, as the machine is shown in Fig. 1, conceal the cut-out portions or recesses m at the ends of the jaw a; but it will be understood that said jaw a is similarly formed at both ends, and the top jaw is provided at each end of the bottom bearing-surface thereofl with similar recesses m3 for a similar purpose. It will also be understood that whenever desired the attachments comprising' the parts f, the plate g, and the plate /t may be removed and the machine used, as originally intended, for bending sheet metal for the purpose of forming cornices and other articles, and in this event we provide dies of the form shown at a and azin Fig. 17 to close the grooves or recesses a* and il in the jaws a and L, respectively, and in order to close the recesses 7 in the jaw c we provide a plate 0, (shown in Fig. 18,) which is similar in all respects to the plate it, except that the thickened top portion It* is removed, and this plate c is connected with the jaws cin the same manner as the plate .7.

The length of the attachments f, g, and /i will depend on the character of the work to `be done, and, if desired, they may extend approximately the full length of the jaws; but in this event the attachments g and /t will be cut off at one end, so as to form a transverse space to accommodate the interlocking end projections of the pipe sections when the sheet of metal is being bent to form the pipesection.

As thus constructed, it will be seen that the attachments f, .0, and /i do not change the form of the front clamping edges of the jaws c and I) nor of the swinging jaw c, but simply provide means whereby said clamping surfaces and edges may be made shorter or longer, as desired, the thickness of the attachments f and g or the adjacent'portions thereof being such as to aifordopen spaces between the main bodies of the jaws into which the interlocking end projections of the pipe-section are passed in theoperation of bending a sheet of metal to form the pipe-section. 1t will also be observed that the attachments which we connect, if desired, with the upper and lower movable jaws of the machine and with the swinging jaw are detachable and may be applied whenever necessary, and the machine when these attachments are not in position may be used for all the purposes for which it was originally intended, and that said attachments constitute supplemental jaw devices, which may be applied to the machine for the purpose herein specified whenever necessary.'

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. Asheet-metal-bending machine,provided withvertically-movable top and bottom clamping-jaws the adjacent surfaces of which are provided at the front thereof with projecting edges, and a swinging jaw mounted in front of the bottom clamping-jaw, each of said jaws being provided with detachable attachments which form supplemental clampingsurfaces and which also form at the ends thereof spaces between the clampingjaws when the latter are in operation, substantially as shown and described.

2. vA machine for bending sheet metal, provided with vertically-movable clamping-jaws arranged one above another, a supplemental swinging jaw supported in front of the bottom clamping-jaw, said clamping-jaws being` provided at their adjacent surfaces with forwardly-directe ;l edges, and each of said jaws being provided with detachable attachments forming operating edges and whereby the clamping-surfaces of the clamping-jaws are separated, substantially as shown and described.

3. A machine for bending sheet metal, provided with vertically-movable clampingjaws arranged one above another, a supplemental swinging jaw supported in front of the bottom clamping-jaw, said clamping-jaws being provided at their adjacent surfaces with forwardly-directed edges, and each of said jaws being provided with detachable attachments whereby the clamping-surfaces of the clamping-jaws are separated, the clamping-surface of the bottom clamping-jaw being also cutout transversely at the ends thereof, substantially as shown and described.

4. A machine of the class described provided with vertically-movable clampingjaws arranged' one above another and means for moving the upper jaw vertically comprising journals mounted in the ends of the frame of the IOO TIO

machine, carnbl0eks connected with the inner presence of the subscribing Witnesses, this ends of said journals and adapted to bear' on 12th day of June, 1903.

said jaw, means for turning said journals s0 EMIL G H STEIN as t0 mise said jaw, and set-serews for lmit- JOHN M'ANDEL ing the upward movement of said jaw, substantially as shown and described. Witnesses:

ln testimony that We chum the foregolng as F. A. STEWART, our nventlon We have Slg-ned our names, in C. E. MULREANY. 

